/* roulang page: index */
:root {
            --primary-blue: #1d4ed8;
            --dark-title: #0f172a;
            --body-text: #334155;
            --light-bg: #f8fafc;
            --card-shadow: 0 4px 20px -4px rgba(15, 23, 42, 0.06);
            --card-hover-shadow: 0 16px 32px -6px rgba(29, 78, 216, 0.12);
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--body-text);
            background-color: #ffffff;
            overflow-x: hidden;
        }
        .custom-card-shadow {
            box-shadow: var(--card-shadow);
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        }
        .custom-card-shadow:hover {
            box-shadow: var(--card-hover-shadow);
            transform: translateY(-4px);
        }
        .section-separator {
            border-bottom: 1px solid #e2e8f0;
        }